Masonry & Factory Built Fireplace Clearances
The minimum required clearances to combustible materials when installed into a masonry replace are:
Adjacent Side
Wall (to side)
Mantel
(to top)
Top Facing
(to top)
Side Facing
(to side)
Min. Hearth
Extension*
Min. Hearth
Elevation*
Min Hearth Side
Width**
A B C D E F G
Small I1200
15" 20" 14" 7-3/8" 16" 1-1/ 2" 8"
Medium I2400
11" 20" 12" 8" 18" 0.5" 8"
Large I3100
13" 19" 18" 6 -1/2" 16" 1.5" 8"
Hearth Heater H2100
10" 25" 14" 8-1/ 2" 18" 1.5" 6"
*Note: If the hearth extension is flush with the floor (item F) it must extend 19.5 in. in front of the body face (item E) (I1100, I3100 & H2100 only).
**Note: Hearth extension width (G) is measured from edge of fuel door to side of hearth.
I1200 I2400 I3100 H2100
Small Insert Medium Insert Large Insert Medium Insert
Maximum BTU*
55,000 75,000 80,000 70,000
Typical Sq. Ft. Heated
600-1000 1000-2000 1800-3000 8 00-1500
Optimum Efficiency
73.8% 77% 71% 72%
Maximum Log Size
18" 18" 21" 18"
Burn Time (Typical)*
up to 8 hrs up to 8 hrs up to 10 hrs up to 8 hrs
Emissions (grams/hour)
3.0g 3.4g 4.2g 3.5g
Firebox Size
1.4 cu. ft. 2.3 cu. ft. 2.9 cu. ft. 1.6 cu. ft.
Flue Size
6" 6" 6" 6"
* Length of burn time and BTU range depend on type of wood, moisture content, climate conditions and installation.
I1200 TOP
Dimensions
I1200 I2400 I3100 H2100
Small Insert Medium Insert Large Insert Medium Insert
Firebox Height
18-3/4" 20 -7/8" 22-3/4" 22-1/ 2"
Height to top of Flue Collar
19 -1/2" 21-1/4" 23-1/8" 20" (without legs)
28" (with legs)
Regular Faceplate (W x H)
38" x 26-1/8" 40" x 30" 44" x 32" 40-1/4" x 30"
Oversize Faceplate (W x H)
44" x 30-1/8" 48" x 33" 50" x 34-1/2" 48" x 33"
* including ashlip
Illustrates Hearth Heater with classic leg option.
Hearth Heater Minimum Fireplace Openings
* To fuel door opening
** Top surface depth
Specications - Wood Inserts
22
Minimum Fireplace Opening I1200 I2400 I3100 H2100
Width (front) 23" 25" 28" 8"
Height 19" 21-1/2" 25" 20" (without legs)
28" (with legs)
Depth (w/ standard flue adaptor)
(w/ offset flue adaptor)
13-3/4"
16-1/2"
17"
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17"
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